JP3042817U - Universal joint - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a universal joint having a simple structure, which is extremely easy to assemble and disassemble, and which increases a mechanical strength of a yoke. SOLUTION: A pair of first and second yokes 1 and 3 having a concave portion 2 formed by a part of a spherical surface on inner surfaces of two forked portions 1a and 3a facing each other at a distance B, and a pair of yokes 1 and 3 are provided. Further, the ball 4 is made by butting the parts at a relative angle of 90 degrees and slidingly contacting the concave parts of the four spherical surfaces.
Both poles of a sphere having a diameter A are cut in parallel to have flat portions 4a at both ends of a thickness C, and the dimensions A, B and C are in the relation of A>B> C. After inserting the thickness C portion of the ball into the forked portion 1a of the first yoke 1, the ball is attached to the axis of the yoke.
Rotate 90 degrees, then attach the second yoke 3 to the thickness C part of the ball.
After inserting the forked portion 3a, the flat portion 4a of the ball 4 is rotated so as to be substantially perpendicular to the axis.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a universal joint having a simple structure and easy to assemble and disassemble.

[0002]

[Prior art]

 Conventionally, a concave portion formed of a part of a spherical surface is formed on the inner surface of each of the forked portions of the yoke, and two forked portions of such a pair of yokes are abutted at a relative angle of 90 degrees to form one concave portion of four spherical surfaces. There is a universal joint that allows balls to intervene freely, and among them, the ball part is integrally molded with one yoke and the concave part formed on the inner surface of the forked part of the other yoke is specified. A universal joint is known that can be inserted into a ball at an angle of.

This universal joint is constructed as shown in FIG. That is, the first yoke 1
The ball portion 12 is integrally formed between the two forked portions 11a of the first, and the second yoke 13 is provided with a recessed portion 14 into which the ball portion 12 can be fitted, on the inner surfaces of the forked portion 13a facing each other. There is. The recess 14 has a groove 14a extending from the edge of the recess 14 so that the recess 14 can be fitted into the ball only in one direction perpendicular to the axis of the universal joint.

Therefore, as shown in FIG. 5 (a), the axis of the second yoke 13 is perpendicular to the axis of the first yoke 11 so that the direction of the groove 14 a faces the ball portion 12. Position it and insert it in the direction of arrow F. When viewed from the direction of the arrow F with the first and second yokes fitted together, it becomes as shown in FIG. 5 (b). If the shafts of both yokes are made linear in the fitted state, the second yoke 13 will not be separated from the ball portion.

[0005]

[Problems to be solved by the device]

 However, in the configuration of the above-mentioned conventional example, one yoke is integrally formed with the ball portion of the other yoke, and the yokes are prevented from separating from each other by bending within a sufficient range during the operation of the universal joint. In order to do so, the shafts of both yokes must be fitted at approximately right angles. Therefore, the bifurcated portion 11a of one yoke needs to be deeply inserted into the root portion of the bifurcated portion 13a of the other yoke, and therefore a large cut 15 is required in the root portion. As a result, sufficient mechanical strength was not obtained, and there was a problem that it could not be applied to heavy-duty universal joints.

[0006] In addition, the other pin and top type universal joints have a problem that it takes a long time to assemble because the clearance tolerance of the joint assembly is small.

The present invention solves the above problems of the prior art, has a simple structure, is extremely easy to assemble and disassemble, and requires only a small insertion angle of the yoke at the time of assembly. It is an object of the present invention to provide a universal joint that can increase the mechanical strength of the yoke.

[0008]

[Means for Solving the Problems]

 To achieve this object, the universal joint of the present invention comprises a pair of first and second yokes each having a recess formed by a part of a spherical surface on the inner surface of the bifurcated portion facing each other at a distance B, and a pair of yokes. A ball that is assembled so that the two forks of the sphere are butted against each other at a relative angle of 90 degrees and are in sliding contact with the recesses of the four spherical surfaces. The ball is formed by cutting both poles of a sphere of diameter A in parallel. C has flat portions of substantially the same area at both ends, and the dimensions of A, B, and C are in the relationship of A> B> C, and the ball thickness C After inserting the part, the ball is rotated 90 degrees with respect to the axis of the yoke, and further, after inserting the bifurcated part of the second yoke interval B into the thickness C part of the ball, The configuration is such that the plane portion is rotated so that it is substantially perpendicular to the axis.

According to the above configuration, the balls can be easily inserted into the first yoke and the second yoke by changing the direction of the balls without making an angle. Finally, since the balls are turned so that the yokes do not separate from each other during operation of the universal joint, there is no need to make a notch at the bifurcated portion, and a yoke that can withstand heavy loads can be provided.

Further, by providing the restricting member for restricting the flat portion of the ball so as to maintain a substantially right angle with respect to the axis of the yoke, the yokes do not separate from each other during operation.

[0011]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes a first fork having a bifurcated portion 1a facing each other at a distance B at one end and having a concave portion 2 formed of a part of a spherical surface on the inner surface thereof. The other end of the yoke has a mounting portion 1b into which the drive shaft end is inserted and fixed, for example. Reference numeral 3 is a second yoke having the same structure as the first yoke 1, and reference numeral 3b is a mounting portion into which a driven shaft is inserted and fixed, for example. In the pair of yokes 1 and 3, the bifurcated portions 1a and 3a are butted at a relative angle of 90 degrees.

Reference numeral 4 is a ball incorporated so as to be in sliding contact with the four spherical concave portions 2. The ball 4 is formed by cutting both poles of a sphere having a diameter A in parallel and having substantially the same thickness at both ends. It has a plane portion 4a of area, and the dimensions of A, B and C are in the relation of A> B> C. Further, 5 is a screw for finally fixing the ball 4 to the first yoke 1.

Next, a method for assembling the universal joint according to the present embodiment will be described with reference to FIG. In FIG. 2 (a), the ball 4 has flat portions 4a at both ends with a thickness C obtained by cutting both poles of a sphere having a diameter A in parallel, and between the gap B between the two forks of the yoke 1. Therefore, there is a relation of A> B> C. Further, 6 is a screw hole which penetrates the ball 4 and into which a screw is inserted. Therefore, first, the thickness C portion of the ball 4 is inserted in the direction of the arrow P between the forked portions 1a of the first yoke 1 at the interval B, and then the ball is attached to the axis of the yoke as shown by the arrow Q. Rotate it once. That is, since the spherical surface of the ball 4 enters the position of the concave portion 2, it can be rotated. The plane portion 4a of the inserted ball 4 is oriented at a right angle to the forked portion 1a.

Next, as shown in FIG. 2 (b), the forked portion 3 a of the second yoke 3 having the interval B is fitted into the thickness C portion of the ball 4. After that, the ball 4 is rotated as shown by the arrow S, and is oriented so that the plane portion is substantially perpendicular to the axis as shown in FIG. 2 (c). At this time, if the second yoke 3 is slightly tilted and a jig such as an adjusting rod is used so that the spherical surface of the ball 4 can be inserted into the recess 2 of the second yoke 3, the ball 4 can be easily moved. Turn to.

Finally, in order for the flat portion 4a to maintain a substantially right angle with respect to the axis of the yoke without the ball 4 rotating during operation, the screw 5 is passed through the screw hole 6 passing through the ball 4. , And is fixed by being screwed into the female screw 7 provided on the first yoke 1.

According to the present embodiment configured as described above, the structure is simple, and the assembling and disassembling are extremely easy. Further, at the time of assembling, the yoke is inserted by inclining the angle of the yoke at a substantially right angle. Since it is not necessary, it is not necessary to cut the base of the yoke, and therefore, the mechanical strength of the york can be secured to a large extent, so it can be applied to a heavy-load universal joint.

In the present embodiment, the screw 5 is fixed to the first yoke 1 in order to restrict the rotation of the incorporated ball 4 during operation. When it is necessary to increase the bending force, for example, as shown in another embodiment of FIG. 3, a spring-loaded rod pin 8 or the like may be interposed between the ball 4 and the yoke to take measures to relieve the bending stress. it can.

In order to make the sliding contact between the ball and the inner recess of the forked portion of the yoke smooth, it is also possible to embed a lubricant such as oil-impregnated metal in the spherical portion of the ball or to increase grease before assembly. it can.

However, if a non-greasing type is required for environment-conscious devices (for example, food, equipment such as pumps, machines, etc.), make it a non-greasing type by appropriately combining the materials of the ball and the yoke. You can

[0020]

[Effect of the invention]

 As described above, the present invention has the following effects. (1) The structure is simple, and general users can easily assemble and disassemble using simple jigs, hexagonal wrenches, etc., and replace worn parts.

(2) Since the mechanical strength of the yoke can be secured to a large extent, it can be applied to a heavy-duty universal joint.

(3) By properly combining the materials of the ball and the yoke, a non-greasing type universal joint can be obtained, which can be applied to an environment-conscious device.

(4) The structure is simple, the number of parts is small, and it can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a view showing an assembled state of a universal joint according to an embodiment of the present invention.

FIG. 2 is a diagram showing a method for assembling the universal joint according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a main part in another embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional example.

FIG. 5 is a diagram illustrating a conventional assembling method.

[Explanation of symbols]

1 ... 1st yoke, 3 ... 2nd yoke, 1a, 3a ...
Bifurcated portion, 2 ... Recessed portion, 4 ... Ball, 4a ...
5 ... Screw, 6 ... Screw hole, 7 ... Female thread, 8 ... Spring-loaded rod pin.

Claims (2)

[Utility model registration claims] 1. A pair of first and second yokes each having a concave portion formed of a part of a spherical surface on an inner surface of the forked portion facing each other at a distance B, and a relative angle of 90 degrees between the forked portions of the pair of yokes. And a ball incorporated so as to slide into the four spherical concave portions, the ball having a diameter A
Both poles of the sphere are cut in parallel to have flat portions of approximately the same area at both ends of thickness C, and the dimensions of A, B and C are A> B.
> C, the thickness C portion of the ball is inserted into the bifurcated portion of the first yoke at the interval B, and then the ball is moved with respect to the axis of the yoke by 90 °.
After rotating the ball so that the forked portion of the second yoke having the interval B is fitted into the thickness C portion of the ball, the ball is rotated so that the plane portion is substantially perpendicular to the axis. Universal joint characterized by 2. The universal joint according to claim 1, further comprising a restricting member for restricting the flat portion of the ball so as to maintain a substantially right angle to the axis of the yoke.